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I'd go with the Macbook Pro Retina (I've used both Windows and Mac, but I've been Windows-free since 2011, so be aware that I'm biased:-).

Upsides: It's cool:-), has a great interface, nice display, Unix command-line when you need it, good ergonomics, it's not Windows 8 (but if you really need Windows-only apps, you can get emulation software), you can get a Mac GitHub client, and Confluence is a web interface, which works fine on my Mac (Firefox or Safari).

Downsides: Some software (MadCap comes to mind) will require an emulator (VirtualBox, VMWare, etc.), some software seems to always be a rev or so behind what's available on Windows, you'll probably get better performance for your dollar with the Lenovo, and you may get a bigger screen (I don't know the 440 and 540 well enough to know).